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A098815 as a simple table

na(n)
1-3
21
325
4121
52041
68185
7131065
8524281
98388601
10536870905
112147483641
12137438953465
132199023255545
148796093022201
15140737488355321
169007199254740985
17576460752303423481
182305843009213693945
19147573952589676412921
202361183241434822606841

[-3,1,25,121,2041,8185,131065,524281,8388601,
 536870905,2147483641,137438953465,2199023255545,
 8796093022201,140737488355321,9007199254740985,
 576460752303423481,2305843009213693945,
 147573952589676412921,2361183241434822606841]